Heat insulation properties of silica aerogel/glass fiber composites fabricated by press forming

Heat insulation properties of silica aerogel/glass fiber composites fabricated by press forming
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压制成型二氧化硅气凝胶/玻璃纤维复合材料的隔热性能

DOI:
10.1016/j.matlet.2012.01.114
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发表时间:
2012-05
期刊:
影响因子:
3
通讯作者:
Li, Hongxia
Li, Hongxia
中科院分区:
材料科学3区
文献类型:
--
作者:
Ding, Shuqiang;Wang, Dongdong;Wang, Gang;Li, Hongxia

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将二氧化硅气凝胶粉末与分散的玻璃纤维压成型,制备了二氧化硅气凝胶/玻璃纤维复合材料。由于纳米多孔结构,二氧化硅气凝胶表现出较低的气体导热系数和固体导热系数。玻璃纤维的加入提高了复合材料的强度,但降低了复合材料的隔热性能。复合材料在20wt时的导热系数。%玻璃纤维在300°C和600°C时分别为0.025W/(m K)和0.030W/(m K)。作为不透明剂,tio2的加入显著降低了辐射导热系数,尤其是在高温下。在700℃时,20wt后从0.041W/(m K)下降到0.030W/(m K)。加入% tio2粉末。
Silica aerogel/glass fiber composites were fabricated by press forming of silica aerogel powders and dispersed glass fibers. Due to the nano porous structure, silica aerogel showed low gas thermal conductivity and solid thermal conductivity. By adding the glass fibers, the strength of the composites was improved but the heat insulation property was deteriorated. The thermal conductivities of the composites with 20wt.% glass fibers at 300°C and 600°C were 0.025W/(m K) and 0.030W/(m K), respectively. As opacifier, the addition of TiO2decreased the radiative thermal conductivity abruptly, especially at high temperatures. At 700°C, it decreased from 0.041W/(m K) to 0.030W/(m K) after 20wt.% TiO2powders were added.
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